Allow for creation of groups during effects import

[MHolmesIV]

Is your feature request related to a problem? Please describe.
Almost every time I import a sequence I bought, I find that the sequence references groups for things I have not yet created a group for (For instance "Yard Only" or "All Megatrees"). So I have to cancel import, go create the groups, and then reimport. This is a huge waste of time.

Describe the solution you'd like
The simplest solution would be a button or something called "Create New Group", which lets you create a new group, and then adds it to the current view so you can assign to it. That way, while importing, I could just go "Oh, I don't have a 'Left Yard' group, but I could!", create the group, map it, and then add models to it once I'm done with the import. This would have saved me a lot of time over the years.

Describe alternatives you've considered
There are no alternatives, the only workaround is to write down the groups I'm missing, exit import, create the groups, add them to my view, and then import again.

Additional context
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